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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
| 6 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
| 7 | |
| 8 #include <stddef.h> | |
| 9 #include <sys/types.h> // For |ssize_t|. | |
| 10 | |
| 11 #include <deque> | |
| 12 | |
| 13 #include "base/memory/scoped_ptr.h" | |
| 14 #include "mojo/edk/embedder/platform_handle.h" | |
| 15 #include "mojo/edk/system/system_impl_export.h" | |
| 16 | |
| 17 struct iovec; // Declared in <sys/uio.h>. | |
| 18 | |
| 19 namespace mojo { | |
| 20 namespace embedder { | |
| 21 | |
| 22 // The maximum number of handles that can be sent "at once" using | |
| 23 // |PlatformChannelSendmsgWithHandles()|. | |
| 24 // TODO(vtl): This number is taken from ipc/file_descriptor_set_posix.h: | |
| 25 // |FileDescriptorSet::kMaxDescriptorsPerMessage|. Where does it come from? | |
| 26 const size_t kPlatformChannelMaxNumHandles = 7; | |
| 27 | |
| 28 // Use these to write to a socket created using |PlatformChannelPair| (or | |
| 29 // equivalent). These are like |write()| and |writev()|, but handle |EINTR| and | |
| 30 // never raise |SIGPIPE|. (Note: On Mac, the suppression of |SIGPIPE| is set up | |
| 31 // by |PlatformChannelPair|.) | |
| 32 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
| 33 PlatformChannelWrite(PlatformHandle h, const void* bytes, size_t num_bytes); | |
| 34 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
| 35 PlatformChannelWritev(PlatformHandle h, struct iovec* iov, size_t num_iov); | |
| 36 | |
| 37 // Writes data, and the given set of |PlatformHandle|s (i.e., file descriptors) | |
| 38 // over the Unix domain socket given by |h| (e.g., created using | |
| 39 // |PlatformChannelPair()|). All the handles must be valid, and there must be at | |
| 40 // least one and at most |kPlatformChannelMaxNumHandles| handles. The return | |
| 41 // value is as for |sendmsg()|, namely -1 on failure and otherwise the number of | |
| 42 // bytes of data sent on success (note that this may not be all the data | |
| 43 // specified by |iov|). (The handles are not closed, regardless of success or | |
| 44 // failure.) | |
| 45 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
| 46 PlatformChannelSendmsgWithHandles(PlatformHandle h, | |
| 47 struct iovec* iov, | |
| 48 size_t num_iov, | |
| 49 PlatformHandle* platform_handles, | |
| 50 size_t num_platform_handles); | |
| 51 | |
| 52 // TODO(vtl): Remove this once I've switched things over to | |
| 53 // |PlatformChannelSendmsgWithHandles()|. | |
| 54 // Sends |PlatformHandle|s (i.e., file descriptors) over the Unix domain socket | |
| 55 // (e.g., created using PlatformChannelPair|). (These will be sent in a single | |
| 56 // message having one null byte of data and one control message header with all | |
| 57 // the file descriptors.) All of the handles must be valid, and there must be at | |
| 58 // most |kPlatformChannelMaxNumHandles| (and at least one handle). Returns true | |
| 59 // on success, in which case it closes all the handles. | |
| 60 MOJO_SYSTEM_IMPL_EXPORT bool PlatformChannelSendHandles(PlatformHandle h, | |
| 61 PlatformHandle* handles, | |
| 62 size_t num_handles); | |
| 63 | |
| 64 // Wrapper around |recvmsg()|, which will extract any attached file descriptors | |
| 65 // (in the control message) to |PlatformHandle|s (and append them to | |
| 66 // |platform_handles|). (This also handles |EINTR|.) | |
| 67 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
| 68 PlatformChannelRecvmsg(PlatformHandle h, | |
| 69 void* buf, | |
| 70 size_t num_bytes, | |
| 71 std::deque<PlatformHandle>* platform_handles); | |
| 72 | |
| 73 } // namespace embedder | |
| 74 } // namespace mojo | |
| 75 | |
| 76 #endif // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
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